New high vacuum system----make money online

hey everyone I thought I'd show you my

latest project this is a new vacuum cart

that I'm building and eventually I plan

to do physical vapor deposition inside

there so with a really high current

heater you can evaporate materials in a

vacuum and then have the materials

solidify on a flat surface so my

ultimate goal here is to either optical

coatings or thin film transistors or any

number of other cool things also

prepping samples for the scanning

electron microscope would be another

good use of this so let me show you how

I did it

the wooden cart is just a cheap IKEA

cart that I got locally and sometimes

working with wood is easier than metal

just because it's easier to drill and

the tolerances aren't quite as tight

however if I had a cheap source a cheap

reliable local source of metal carts

kind of like I used for the sound I

would use those instead the metal plate

is a one-inch thick piece of aluminum

which is probably overkill that there's

some benefits of using a nice thick

piece the main one being that you can

drill blind holes into either side tap

the holes and then use those as support

points without going through the

material so if the plate were only a

quarter-inch thick you really couldn't

drill a blind hole because you be going

through the other side or you'd only be

able to get you know 1/8 inches of

engagement there which isn't quite

enough so today I machine to the plate

and that involves using a large fit to

cut out a couple of holes let me know if

you wanted me to do a like a tutorial on

machining I don't know I haven't done a

tutorial video in a while so let me know

if that would be interesting to you guys

and then I cut a gland for the o-ring

which will seal the diffusion pump which

is clamped on to the bottom of the of

the vacuum chamber and in the

description I've got a link to a page

that will tell you what the dimensions

of the glands should be

there's actually originally when I

started making oring seals I would make

the glans way too small and this is

actually a problem because you need

clamp the two pieces together the o-ring

has nowhere to squeeze into and you

actually end up with not as good of a

seal as if you had a properly sized

gland so always check the chart and make

sure that you're cutting the right size

gland

besides the diffusion pump which is the

thing that's actually creating the high

vacuum inside the chamber the only other

thing I have connected right now is a

penning gage which I refurbished in an

earlier video the penning gage reads

from about ten to ten to the negative

seven to ten to the negative three about

millibar

so the pumps have been running for about

an hour total the roughing pump has run

for about 15 or 20 minutes first and

then the diffusion pump was switched on

and after about an hour total we're down

to about ten to the negative five

millibar in the chamber and the four

line is about a hundred ninety Millett

or I'm using the Harbor Freight three

CFM air conditioning service compressor

and there we've got the new water

chiller that I showed in the previous

video keeping the water at about mid 60

degree F range here's a view of the

backside of the plumbing the diffusion

pump is an Edwards

diff stack and the opening on the top is

maybe about three and a half inches so

it's probably a four-inch nominal

diffusion pump and it has an integrated

water baffle which is pretty cool

because on my last project I had to make

a water bath hole to keep oil from the

diffusion pump from getting back up into

the chamber if you're unfamiliar with

these they work by boiling oil in the

bottom of the container and then that

oil vapor rises up to the top and comes

out of a jet so the way that it actually

creates vacuum is by sort of spraying

the air molecules out of the chamber

with this oil jet think of like blowing

away dry leaves with like a garden hose

same basic idea it's like a momentum

transfer pump

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